Graphene heating ceramic substrate and preparation method thereof

Abstract

The invention provides a graphene heating ceramic substrate and a preparation method thereof, and the specific steps are as follows: S1, preparing an electrode on the surface of a ceramic substrate with the smoothness Ra less than 0.008 [mu] m to obtain a pretreated ceramic substrate; s2, coating the surface of the pretreated ceramic substrate with a graphene coating, drying and sintering to obtain a graphene heating ceramic substrate; the graphene coating is prepared by mixing graphene, a silane coupling agent, potassium silicate, silicone acrylic emulsion, sodium polyacrylate, a defoaming agent and a film-forming agent. The graphene coating is prepared through a novel method, the method is simple and easy to implement, the graphene coating has high binding force with the ceramic substrate with the pretreated surface, the preparation technology of the graphene heating ceramic substrate is simplified, the yield and heating efficiency are improved, and a safe and environment-friendly heating mode is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of surface modification of metal composite materials, and in particular to a graphene heating ceramic substrate and a preparation method thereof. Background Art

[0002] Graphene-coated ceramic composite substrate is a new type of substrate material that combines the ultra-high electrical conductivity of graphene and the excellent mechanical properties of ceramic materials. It achieves comprehensive improvements in electrical conductivity, thermal management performance, mechanical properties, etc. by coating a layer of graphene film on the surface of ceramic substrates (such as aluminum oxide, aluminum nitride, zirconium oxide, etc.) and utilizing the synergistic effect between graphene and ceramics. This composite substrate not only has the characteristics of graphene such as ultra-thinness, lightness, and high strength, but also inherits the high temperature stability, corrosion resistance, and good mechanical strength of ceramic materials.

[0003] Although graphene-coated ceramic composite substrates have many advantages, they still face some problems in practical applications:

[0004] 1. The preparation process of graphene is complicated and requires precise control of reaction conditions and process parameters. At the same time, it is also a technical challenge to evenly and firmly coat graphene on the surface of ceramic substrates. Due to the complexity of the process and technical difficulty, the yield of graphene-coated ceramic composite substrates is low, which increases the production cost.

[0005] 2. Due to the differences in physical and chemical properties between graphene and ceramic materials (such as surface energy, wettability, etc.), the bonding force between the two is weak, which may lead to problems such as coating shedding or performance degradation during use.

[0006] The above problems will affect the overall performance and service life of the composite substrate. Due to the complex preparation process and low yield rate, the production cost of graphene-coated ceramic composite substrates is high. This increases the manufacturing cost of electronic devices and limits their promotion in some cost-sensitive application fields. Due to the differences in the physical and chemical properties of graphene and ceramic materials, the bonding strength between the two is often not ideal. Summary of the invention

[0007] In order to solve the problems of complex graphene preparation process, low yield and poor bonding between graphene and ceramic substrate in the prior art, the present invention provides a graphene heating ceramic substrate and a preparation method. The graphene coating is prepared by the new method, which is simple and easy, and has a strong bonding force with the ceramic substrate with pretreated surface.

[0008] To achieve the above object, the present invention provides the following technical solution: a method for preparing a graphene heating ceramic substrate, the specific steps are as follows:

[0009] S1, preparing an electrode on the surface of a ceramic substrate with a smoothness Ra < 0.008 μm to obtain a pretreated ceramic substrate;

[0010] S2, coating the graphene coating on the surface of the pretreated ceramic substrate, drying and sintering to obtain a graphene heating ceramic substrate;

[0011] The graphene coating is prepared by mixing graphene, a silane coupling agent, potassium silicate, a silicone-acrylic emulsion, sodium polyacrylate, a defoamer and a film-forming agent.

[0012] Furthermore, in S1, after cleaning and drying the surface of the ceramic substrate with acetone degreasing agent and weak acid salt, the surface of the ceramic substrate is polished to a plane finish Ra < 0.008 μm, and then the polished surface of the ceramic substrate is cleaned and dried with acetone degreasing agent and weak acid salt.

[0013] Furthermore, in S1, a conductive paste is coated on the surface of a ceramic substrate having a smoothness Ra < 0.008 μm, and sintered and solidified to obtain a pretreated ceramic substrate having an electrode on the surface, and the conductive paste is made of gold, copper or silver.

[0014] Furthermore, in S1, a 5 mm to 30 mm thick conductive slurry is coated on the surface of a ceramic substrate having a smoothness Ra < 0.008 μm, and the substrate is sintered in air or nitrogen atmosphere at 200° C. to 1200° C. for 30 min to 120 min to obtain a pretreated ceramic substrate having an electrode on the surface.

[0015] Furthermore, in S2, the preparation method of the graphene coating is as follows:

[0016] S2.1 dissolving 1 part of graphene and 2 parts of silane coupling agent in 10 to 20 parts of distilled water, and stirring to obtain a graphene dispersion;

[0017] S2.2, by mass fraction, adding 10% to 20% potassium silicate and 5% to 10% silicone-acrylic emulsion to the graphene dispersion, and stirring to obtain a base material;

[0018] S2.3 Add 1% to 5% of sodium polyacrylate, 2% to 8% of a defoaming agent and 2% to 5% of a film-forming agent to the base material to obtain a mixed solution, and stir the mixed solution to prepare a graphene coating.

[0019] Furthermore, in S2, the preparation method of the graphene coating is as follows:

[0020] S2.1 Dissolve 1 part of graphene and 2 parts of silane coupling agent in 10-20 parts of distilled water, stir at a speed of 500 r / min-1500 r / min for 20 min-30 min, and ultrasonicate for 5 min-20 min to obtain a graphene dispersion;

[0021] S2.2, by mass fraction, adding 10% to 20% potassium silicate and 5% to 10% silicone-acrylic emulsion to the graphene dispersion, and stirring at a speed of 500 r / min to 1500 r / min for 30 min to obtain a base material;

[0022] S2.3 1% to 5% of sodium polyacrylate, 2% to 8% of a defoaming agent and 2% to 5% of a film-forming agent are added to the base material to obtain a mixed solution, and the mixed solution is stirred at 500 r / min to 1500 r / min for 20 min to 60 min to prepare a graphene coating.

[0023] Furthermore, in S2, the modulus of the potassium silicate is 5.5.

[0024] Further, in S2, the graphene coating is sprayed on the surface of the pretreated ceramic substrate, dried at 80°C to 120°C for 10min to 50min, and then kept at 500°C to 1000°C for 10min to 90min to obtain a graphene heating ceramic substrate.

[0025] Furthermore, in S2, the graphene coating is sprayed on the surface of the pretreated ceramic substrate, and the spraying thickness of the graphene coating is 10 μm to 100 μm.

[0026] The present invention provides a graphene heating ceramic substrate, which is prepared by adopting the above preparation method.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The present invention provides a method for preparing a graphene heating ceramic substrate, wherein the surface of the ceramic substrate is pretreated to improve the adhesion of the coating, and the components such as silane coupling agent and potassium silicate in the graphene coating can effectively enhance the bonding force between the graphene and the ceramic substrate, ensuring that the coating is not easy to fall off during use. The components such as silane coupling agent and potassium silicate in the graphene coating can effectively enhance the bonding force between the graphene and the ceramic substrate, ensuring that the coating is not easy to fall off during use. The electrode coated on the surface of the ceramic substrate can effectively increase the current density of the local graphene, thereby further improving the heating efficiency. The present invention realizes the preparation and coating of the graphene coating through simple steps, avoiding the complexity of the traditional graphene preparation process. The coating formula and coating process adopted have a high yield rate, improved production efficiency, and reduced production costs.

[0029] The graphene coating on the graphene heating ceramic substrate prepared by the present invention has good electrical conductivity and thermal conductivity, can quickly respond to current changes and generate heat. Experiments show that the graphene heating ceramic substrate of the present invention can reach 140 degrees in about 3 minutes, and the heating rate is far higher than that of traditional heating wires; when working, the system voltage is lower than the safety voltage (24V), which greatly reduces the risk of electric shock and ensures the personal safety of users; and the graphene coating does not produce harmful substances such as exhaust gas and carbon dioxide during operation, and has no emissions, pollution, or noise, thus achieving a clean and environmentally friendly heating method. After the graphene heating ceramic substrate is installed, it requires almost no maintenance under normal use, reducing the long-term use cost. The heating method provided by the graphene heating coating is warm and comfortable, which is beneficial to human health. The windless and dust-free heating environment avoids the problems of dryness and discomfort that may be caused by traditional heating methods.

[0030] In summary, the present invention not only simplifies the preparation process of the graphene heating ceramic substrate, improves the yield and heating efficiency, but also realizes a safe and environmentally friendly heating method. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A physical picture of a graphene heating ceramic substrate of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the present invention, unless otherwise specified, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0034] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0035] In the present invention, unless otherwise specified, percentage (%) or part refers to the weight percentage or weight part relative to the composition.

[0036] In the present invention, unless otherwise specified, the components or preferred components involved can be combined with each other to form a new technical solution.

[0037] In the present invention, unless otherwise specified, the numerical range "a-b" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed in this document, and "6-22" is just an abbreviation of these numerical combinations.

[0038] The “range” disclosed in the present invention is in the form of a lower limit and an upper limit, which can be one or more lower limits, and one or more upper limits, respectively.

[0039] In the present invention, the term "and / or" used herein refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0040] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in accordance with the sequence. Preferably, the reaction method herein is carried out sequentially.

[0041] Unless otherwise specified, the professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the described content may also be applied to the present invention.

[0042] like Figure 1 As shown, the present invention provides a graphene heating ceramic substrate, and the preparation method thereof is as follows:

[0043] S1. Surface pretreatment of ceramic substrate

[0044] S1.1. Degrease the surface of the ceramic substrate with 20g / L to 50g / L acetone degreasing agent and dry it; then wash it with water at a temperature of 10℃ to 70℃ for 5min to 20min, and clean it with a weak acid salt to decontaminate and activate the surface at a temperature of 10℃ to 50℃ for 20Sec to 50Sec;

[0045] Preferably, the ceramic substrate is an aluminum oxide ceramic substrate, an aluminum nitride ceramic substrate or a zirconium oxide ceramic substrate.

[0046] S1.2. Polish the cleaned surface of the ceramic substrate on a grinder until the surface finish Ra is less than 0.008 μm. After polishing, clean it using the S1 method. After cleaning, dry it in an oven at 100°C to 120°C for 10min to 30min.

[0047] S1.3 Spray the sintered surface of the ceramic substrate with a conductive slurry of gold, copper or silver with a thickness of 5mm to 30mm. The sintering atmosphere is air or nitrogen. Place it in a vacuum furnace and heat it for 40 minutes to a sintering curing temperature of 200℃ to 1200℃, then keep it warm for 30min to 120min, and finally cool it naturally to room temperature.

[0048] S2. Preparation of graphene coating

[0049] S2.1 Dissolve 1 part of graphene and 2 parts of silane coupling agent in 10-20 parts of distilled water, stir at a speed of 500 r / min-1500 r / min for 20 min-30 min, and then put it into an ultrasonic cleaner for 5 min-20 min to obtain a graphene dispersion;

[0050] S2.2, by mass fraction, adding 10% to 20% potassium silicate and 5% to 10% silicone-acrylic emulsion to the graphene dispersion, and stirring at a speed of 500 r / min to 1500 r / min for 30 min to obtain a base material;

[0051] S2.3 1% to 5% of sodium polyacrylate, 2% to 8% of a defoaming agent and 2% to 5% of a film-forming agent are sequentially added to the base material to obtain a mixed solution, and the mixed solution is stirred at 500 r / min to 1500 r / min for 20 min to 60 min to prepare a graphene coating;

[0052] Preferably, the modulus of potassium silicate is 5.5.

[0053] S3. Preparation of graphene heating ceramic substrate

[0054] Load the graphene coating into the spray gun and spray it evenly on the surface of the ceramic substrate treated with S1. The thickness is generally 10μm to 100μm, which is adjusted according to the power required for heating. After spraying, place the ceramic substrate in an oven and dry it at 80℃ to 120℃ for 10min to 50min. Then put it into a sintering furnace and heat it at a rate of 8℃ / min to 500℃ to 1000℃ for 10min to 90min to make a graphene heating ceramic substrate.

[0055] The graphene heating ceramic substrate of the present invention heats up quickly, has high heat conversion efficiency and high emissivity, and graphene is a special heating element. The electric heat energy conversion rate is above 99.2, the surface temperature of the heating body rises rapidly, and the heat energy is transferred to the covering on the surface of the carbon fiber electric heating material plate, so that the surface temperature of the covering continues to rise, and it is used in semiconductor suction cups, industrial injection molding, new technology floor heating and other fields.

[0056] The present invention simplifies the preparation process through the steps of pre-treatment of the ceramic substrate, spray printing of metal slurry to pre-sinter the electrode and preparation of graphene heating coating, thereby improving the yield rate of the graphene heating ceramic substrate, the bonding strength of the graphene coating and the heating efficiency. The heating efficiency of the graphene heating ceramic substrate prepared by the above method is tested. Compared with the heating efficiency requirement of 10°C to 20°C / minute of the existing heating wire, the graphene heating ceramic substrate of the present invention can be heated to 140°C in about 3 minutes, and the performance is much higher than that of the existing heating wire, further demonstrating the application potential of graphene in the heating field.

[0057] In summary, the graphene heating ceramic substrate of the present invention can significantly improve the performance of electronic devices. Its ultra-high conductivity and excellent thermal management performance will help to achieve faster signal transmission and more effective heat dissipation, and will promote the innovative development of the electronics industry.

[0058] Example 1

[0059] The present invention provides a graphene heating ceramic substrate, and the preparation method thereof is as follows:

[0060] S1. Surface pretreatment of ceramic substrate

[0061] S1.1. Degrease the surface of the alumina ceramic substrate with 20g / L acetone degreasing agent and dry it; then wash it with water at a temperature of 10°C for 20 minutes, and clean it with a weak acid salt to decontaminate and activate the surface at a temperature of 10°C for 50 seconds;

[0062] S1.2. Polish the cleaned surface of the alumina ceramic substrate on a grinder until the surface finish Ra is less than 0.008 μm. After polishing, clean it using the S1 method and dry it in an oven at 100°C for 30 minutes.

[0063] S1.3 Spray 5mm thick silver conductive paste on the sintered surface of the alumina ceramic substrate, the sintering atmosphere is nitrogen, put it into a nitrogen atmosphere vacuum furnace and heat it for 40 minutes to the sintering curing temperature of 200℃, then keep it warm for 120 minutes, and finally cool it naturally to room temperature. After sintering, the silver paste circuit has high strength, shear force greater than 50Mpa, porosity less than 2%, thermal conductivity up to 150W / m·K, good production compatibility, can be sintered in air or weak nitrogen environment, and is free of cleaning, lead-free, and meets ROHS standards.

[0064] S2. Preparation of graphene coating

[0065] S2.1 Dissolve 1 part of graphene and 2 parts of silane coupling agent in 10 parts of distilled water, stir at 500 r / min for 30 min, and then put it into an ultrasonic cleaner for 5 min to obtain a graphene dispersion;

[0066] S2.2, by mass fraction, 10% potassium silicate with a modulus of 5.5 and 5% silicone-acrylic emulsion were added to the graphene dispersion, and stirred at a speed of 500 r / min for 30 min to obtain a base material;

[0067] S2.3 1% sodium polyacrylate, 2% defoaming agent and 2% film-forming agent are sequentially added to the base material to obtain a mixed solution, and the mixed solution is stirred at 500 r / min for 60 min to prepare a graphene coating;

[0068] S3. Preparation of graphene heating ceramic substrate

[0069] The graphene coating was loaded into a spray gun and evenly sprayed on the surface of the ceramic substrate treated with S1. After spraying, the ceramic substrate was placed in an oven and dried at 80°C for 50 minutes. Then, it was placed in a sintering furnace and heated at a rate of 8°C / min to 500°C for 90 minutes to make a graphene heating ceramic substrate.

[0070] Example 2

[0071] The present invention provides a graphene heating ceramic substrate, and the preparation method thereof is as follows:

[0072] S1. Surface pretreatment of ceramic substrate

[0073] S1.1. Degrease the surface of the ceramic substrate with 35g / L acetone degreasing agent and dry it; then wash it with water at a temperature of 50°C for 10 minutes, and clean it with a weak acid salt to decontaminate and activate the surface at a temperature of 35°C for 35 seconds;

[0074] Preferably, the ceramic substrate is an aluminum oxide ceramic substrate, an aluminum nitride ceramic substrate or a zirconium oxide ceramic substrate.

[0075] S1.2. Polish the cleaned surface of the ceramic substrate on a grinder until the surface finish Ra is less than 0.008 μm. After polishing, clean it using the S1 method and dry it in an oven at 110° C. for 20 minutes.

[0076] S1.3 Spray a 15 mm thick gold conductive slurry on the sintered surface of the ceramic substrate. The sintering atmosphere is air. Place the substrate in a vacuum furnace and heat it for 40 min to a sintering curing temperature of 800°C. Then keep the temperature for 100 min and cool it naturally to room temperature.

[0077] S2. Preparation of graphene coating

[0078] S2.1 Dissolve 1 part of graphene and 2 parts of silane coupling agent in 15 parts of distilled water, stir at 800 r / min for 25 min, and then put it into an ultrasonic cleaner for 15 min to obtain a graphene dispersion;

[0079] S2.2, by mass fraction, 15% potassium silicate with a modulus of 5.5 and 8% silicone-acrylic emulsion were added to the graphene dispersion, and stirred at a speed of 1000 r / min for 30 min to obtain a base material;

[0080] S2.3 3% sodium polyacrylate, 5% defoaming agent and 3% film-forming agent are sequentially added to the base material to obtain a mixed solution, and the mixed solution is stirred at 1000 r / min for 40 min to prepare a graphene coating;

[0081] S3. Preparation of graphene heating ceramic substrate

[0082] Load the graphene coating into the spray gun and spray it evenly on the surface of the ceramic substrate treated with S1. After spraying, place the ceramic substrate in an oven and dry it at 100°C for 25 minutes. Then, place it in a sintering furnace and heat it up at a rate of 8°C / min to 800°C for 50 minutes to make a graphene heating ceramic substrate.

[0083] Example 3

[0084] The present invention provides a graphene heating ceramic substrate, and the preparation method thereof is as follows:

[0085] S1. Surface pretreatment of ceramic substrate

[0086] S1.1. Degrease the surface of the ceramic substrate with 50g / L acetone degreasing agent and dry it; then wash it with water at a temperature of 70°C for 5 minutes, and clean it with a weak acid salt to decontaminate and activate the surface at a temperature of 50°C for 20 seconds;

[0087] Preferably, the ceramic substrate is an aluminum oxide ceramic substrate, an aluminum nitride ceramic substrate or a zirconium oxide ceramic substrate.

[0088] S1.2. Polish the cleaned surface of the ceramic substrate on a grinder until the surface finish Ra is less than 0.008 μm. After polishing, clean it using the S1 method and dry it in an oven at 120° C. for 10 minutes.

[0089] S1.3 Spray a 30mm thick conductive slurry of gold, copper or silver on the sintered surface of the ceramic substrate. The sintering atmosphere is air or nitrogen. Place the substrate in a vacuum furnace and heat it for 40 minutes to a sintering curing temperature of 1200°C. Then keep it warm for 30 minutes and finally cool it naturally to room temperature.

[0090] S2. Preparation of graphene coating

[0091] S2.1 Dissolve 1 part of graphene and 2 parts of silane coupling agent in 20 parts of distilled water, stir at 1500 r / min for 20 min, and then put it into an ultrasonic cleaner for 5 min to obtain a graphene dispersion;

[0092] S2.2, by mass fraction, 20% potassium silicate with a modulus of 5.5 and 10% silicone-acrylic emulsion were added to the graphene dispersion, and stirred at a speed of 1500 r / min for 30 min to obtain a base material;

[0093] S2.3 5% sodium polyacrylate, 8% defoaming agent and 5% film-forming agent are sequentially added to the base material to obtain a mixed solution, and the mixed solution is stirred at 1500 r / min for 20 min to prepare a graphene coating;

[0094] S3. Preparation of graphene heating ceramic substrate

[0095] Load the graphene coating into the spray gun and spray it evenly on the surface of the ceramic substrate treated with S1. After spraying, place the ceramic substrate in an oven and dry it at 120°C for 10 minutes. Then, place it in a sintering furnace and heat it at a rate of 8°C / min to 1000°C for 10 minutes to make a graphene heating ceramic substrate.

Claims

1. A method for preparing a graphene heating ceramic substrate, It is characterized in that The specific steps are as follows: S1, preparing an electrode on the surface of a ceramic substrate with a smoothness Ra < 0.008 μm to obtain a pretreated ceramic substrate; S2, coating the graphene coating on the surface of the pretreated ceramic substrate, drying and sintering to obtain a graphene heating ceramic substrate; The graphene coating is prepared by mixing graphene, a silane coupling agent, potassium silicate, a silicone-acrylic emulsion, sodium polyacrylate, a defoamer and a film-forming agent.

2. A method for preparing a graphene heating ceramic substrate according to claim 1, It is characterized in that In S1, the surface of the ceramic substrate is cleaned and dried with acetone degreasing agent and weak acid salt, and then the surface of the ceramic substrate is polished to a plane finish Ra < 0.008 μm, and then the polished surface of the ceramic substrate is cleaned and dried with acetone degreasing agent and weak acid salt.

3. A method for preparing a graphene heating ceramic substrate according to claim 1, It is characterized in that In S1, a conductive paste is coated on the surface of a ceramic substrate with a smoothness Ra < 0.008 μm, and sintered and solidified to obtain a pretreated ceramic substrate with electrodes on the surface. The conductive paste is made of gold, copper or silver.

4. A method for preparing a graphene heating ceramic substrate according to claim 3, It is characterized in that In S1, a 5 mm to 30 mm thick conductive paste is coated on the surface of a ceramic substrate with a smoothness Ra < 0.008 μm, and the substrate is sintered in air or nitrogen atmosphere at 200° C. to 1200° C. for 30 min to 120 min to obtain a pretreated ceramic substrate with an electrode on the surface.

5. A method for preparing a graphene heating ceramic substrate according to claim 1, It is characterized in that In S2, the preparation method of the graphene coating is as follows: S2.1 dissolving 1 part of graphene and 2 parts of silane coupling agent in 10 to 20 parts of distilled water, and stirring to obtain a graphene dispersion; S2.2, by mass fraction, adding 10% to 20% potassium silicate and 5% to 10% silicone-acrylic emulsion to the graphene dispersion, and stirring to obtain a base material; S2.3 Add 1% to 5% of sodium polyacrylate, 2% to 8% of a defoaming agent and 2% to 5% of a film-forming agent to the base material to obtain a mixed solution, and stir the mixed solution to prepare a graphene coating.

6. A method for preparing a graphene heating ceramic substrate according to claim 5, It is characterized in that In S2, the preparation method of the graphene coating is as follows: S2.1 Dissolve 1 part of graphene and 2 parts of silane coupling agent in 10-20 parts of distilled water, stir at a speed of 500 r / min-1500 r / min for 20 min-30 min, and ultrasonicate for 5 min-20 min to obtain a graphene dispersion; S2.2, by mass fraction, adding 10% to 20% potassium silicate and 5% to 10% silicone-acrylic emulsion to the graphene dispersion, and stirring at a speed of 500 r / min to 1500 r / min for 30 min to obtain a base material; S2.3 1% to 5% of sodium polyacrylate, 2% to 8% of a defoaming agent and 2% to 5% of a film-forming agent are added to the base material to obtain a mixed solution, and the mixed solution is stirred at 500 r / min to 1500 r / min for 20 min to 60 min to prepare a graphene coating.

7. A method for preparing a graphene heating ceramic substrate according to claim 1, It is characterized in that In S2, the modulus of the potassium silicate is 5.

5.

8. A method for preparing a graphene heating ceramic substrate according to claim 1, It is characterized in that In S2, the graphene coating is sprayed on the surface of the pretreated ceramic substrate, dried at 80°C to 120°C for 10min to 50min, and then kept at 500°C to 1000°C for 10min to 90min to obtain a graphene heating ceramic substrate.

9. A method for preparing a graphene heating ceramic substrate according to claim 1, It is characterized in that In S2, the graphene coating is sprayed on the surface of the pretreated ceramic substrate, and the graphene coating has a spraying thickness of 10 μm to 100 μm.

10. A graphene heating ceramic substrate, It is characterized in that The method is prepared according to any one of claims 1 to 7.

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